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Malaysian police visited former Prime Minister Najib Razak's house late on Wednesday, reportedly searching for documents as part of a renewed probe into a massive corruption scandal involving a state investment fund that is being investigated abroad.

More than a dozen police vehicles arrived at Najib's house shortly after he returned home from prayers at a nearby mosque.

The move fuels speculation that he may be arrested after new Prime Minister Mahathir Mohamad warned that he could be charged soon over the 1MDB fund fiasco.

Commercial crime director Amar Singh Ishar Singh told local media that police were searching for evidence in an ongoing probe and that it was being carried out at five locations belonging to or linked to Najib.

He declined to give details. Police officials couldn't be immediately reached for comment.

The national Bernama news agency cited sources as saying that the police were searching for documents related to 1MDB and that raids occurred simultaneously at the prime minister's office, the prime minister's official residence and an upscale condominium in the city.

Mahathir has not yet moved into the prime minister's office or residence.

He reopened a probe into the 1MDB scandal after his alliance won a stunning election victory last week, ousting Najib and ending the National Front's 60-year grip on power.

Najib started the fund in 2009 and US investigators say at least 4.5 billion US dollars was stolen and laundered by Najib's associates, some of which landed in his bank account.

Earlier on Wednesday, Mahathir said the government would make arrests as soon as there is clear evidence and reiterated that there will be "no deal" for Najib in the scandal.

Mahathir, 92, said an initial investigation showed the scale of wrongdoing by Najib's administration was more serious than expected.